Today Organic Carbon Chemistrybarbara.cm.utexas.edu/courses/ch302/files/CH302_042611.pdf · Today Organic Carbon Chemistry ... Organic You know more than you think already What you

Principles of Chemistry II © Vanden Bout

Today

Organic

Carbon Chemistry


Organic

You know more than you think already

What you will needLewis dot, VSEPR

VB, hybrid orbitals, MOelectronegativity

intermolecular forces


Two hurdles we will deal with

Understanding structuresNomenclature

IbuprofenRS)-2-(4-(2-methylpropyl)phenyl)propanoic acid


R)-3,4-dihydroxy-5-((S)- 1,2-dihydroxyethyl)furan-2(5H)-oneL-ascorbic acid

vitamin C


First Structures

Let’s look at a simple moleculebutane C4H10


A. 0

B. 4

C. 5

D. 6

E. 7

How many carbon atoms does this molecule have?


A. 6

B. 10

C. 12

D. 14

E. 16

How many hyrdogen atoms does this molecule have?


How many carbons and hydrogens in the following?

A. 6 C, 14 H

B. 6 C, 15 H

C. 6 C, 16 H

D. 7 C, 15 H

E. 7 C, 14 H


How many carbons and hydrogens in the following?

A. 6 C, 14 H

B. 6 C, 15 H

C. 6 C, 16 H

D. 7 C, 15 H

E. 7 C, 14 H

3H

3H

3H

2H

1H

1H

1H


this is the structure for caffeine

how many hydrogens are not shown?

A. 0

B. 1

C. 2

D. 3

E. 4


Step 1

Nomenclature

prefix parent suffix

parent is the name of the longest carbon chain. Each length has a given name

1 carbon methane2 carbons ethane5 carbons pentane


Step 1

Nomenclature


suffix is the name of the "functional group"

-ol alcohol-one ketone-ane alkane


Step 1

Nomenclature


prefix is the name of any substituent groups typically a carbon chain(sidechains)

1 carbon methyl2 carbons ethyl5 carbons pentyl


Names for parent groups

First lets look at alkanes(essentially no functional group)

All single bonds

suffix is ane

methane butane 5-methyloctane



The following compound is

A. butane

B. isobutane

C. pentane

D. hexane

E. heptane

CH3CH2CH2CH2CH2CH3


What about sidechains?



A. 3-ethylhexane

B. 3-ethylpropane

C. 4-propylhexane

D. 4-ethylheptane

E. 3-ethylocatne


Which numbers do I use?

longest main chainlowest possible numbers


The next simplestadd a functional group

C=C Double bond

suffix -ene

C=C Triple bond

suffix -yne




A. 2-hexene

B. 3-hexene

C. 4-heptene

D. 4-hexene

E. 2 methyl, butene



A. 5-methyl 2-hexene

B. 2-methyl 5-hexene


Nomenclature with functional group

Put the number by before the functional group suffix

old system(everyone uses)

1 butene

official IUPACname

but-1-ene


Name this compound

A. 2-methyl 5-pentene

B. 2-methyl 3-hexene

C. 1,1-dimethyl 2-pentene

D. 5-methyl 3-hexene

E. 5-methyl 4-hexene


Other side-chains

HalogensF FluoroCl ChloroBr BromoI Iodo

OH grouphydroxy

NH2 groupamino

Benzene Ringphenyl


Cyclic Hydrocarbonsthe carbon chain connects back to itself

cyclobutane


Structural Isomers

hexane (C6H14)


Are these the same molecule?

A. YesB. No


Structural Isomer(constitutional isomers)

Stereo Isomer(spatial isomers)

Same atoms and bonds, different bonding pattern

Same bonding pattern, different orientations in space


Structural isomers

n-hexane 2 methyl pentane


StereoisomersDiastereomer(can interconvert)

cis dichloro ethene trans dichloroethene


Stereoisomers Enantiomers(chiral molecules)

Molecules cannot be superimposed(left and right hand versions)


Chiral Center(place where the chirality arises)

Carbon (or other atom)with 4 different substituents

R)-3,4-dihydroxy-5-((S)- 1,2-dihydroxyethyl)furan-2(5H)-oneL-ascorbic acidvitamin C


IbuprofenRS)-2-(4-(2-methylpropyl)phenyl)propanoic acid


Dienes

Two double bonds

5 carbon chain, parent penta

no side chains

two double bonds dieneposition 1 and 3

penta-1,3-diene


Alkyne

Carbon Carbon Triple Bond

Suffix -yne

2 methyl hex-3-yne

1

2345

6


Other functional groups

RR = Generic representation of the rest of the molecule

OHfunctional group

-OH group is an alcoholsuffix is -ol

CommonEthanol


Name this compound

A. heptan-2-ol

B. hexan-4-ol

C. 2-ethylbutan-1-ol

D. 2-ethylpentan-1-ol

E. hexan-3-ol

OH


Ketone

Rcarbon double bonded to an oxygen

bonded to carbons on either sidesuffix is -one

CO

R

CommonAcetone

(nail polish remover)


Which of the following is a ketone?

A. A

B. B

C. C

D. A & B

E. all three

O O O

O

A B C

butan-3-one

H


Aldehyde


bonded to carbon on one side (like a ketone at the end of a chain)

suffix is -al

CO

H

CommonFormaldehyde

(Fetal Pig Storage)


Name this compound

A. hex-3-enal

B. hex-3-en-1-al

C. hex-3-en-6-al

D. hex-6-al-3-ene

E. hexene6-3-al

O

No need to number aldehydeits always at the end

H shown to emphasize thefunctional group

H


Carboxylic Acid


bonded to carbon on one side OH on the other side

suffix is -oic acid

CO

OH

CommonAcetic Acid(vinegar)


Name this compound

A. methanoic acid

B. ethanoic acid

C. propanoic acid

D. 3 hydroxy propan-2-one

E. propanol

OH

No need to number carboxylic acidits always at the end

this compound is alsocommonly known as acetic acid

O


Ester


bonded to carbon on one side OR on the other side

suffix is -oic acid

CO

O

Commonlots of flavorings

R'


Name this compound

A. ethyl butanoate

B. butyl methanoate

C. methyl heptanoate

D. butyl ethanoate

E. pentyl ethanoate

O

No need to number estername the two sides

part with the carboxyl (C=O)is the parent

other part is like the side chain

O


Ether

R

carbon oxygen in the middle of the chainsuffix is -ether

ODiethyl Ether

(knocks you out)

R'


O

Treat as two "side chains"

methyl ethyl ether


Primary Amine

R NH2

-NH2 group is an aminesuffix is -amine


Amide


bonded to carbon on one side N on the other side

suffix is -amide

CO

N R'R"


Naming amide Treat part with C=O as parentparts on the N as sidechains

O

NH2

pentanamide

O

N

N-ethyl-N-methylpentanamide


NH2

O

O

O

N

Amine

Ether

Ketone

Amide


OH

O

O

O

Alcohol

Carboxylic Acid

Ester

Alkene

OH

OH


Important Reaction for Biochemistry

Formation of an Amide

The don't call them functional groups for nothing

Carboxylic Acid

RC

O

OH

Primary Amine

NH

R'H


Carboxylic Acid

RC

O

OH

Primary Amine

NH

R'H

Amide + Water

RC

O

N R'H

+ H2O


Amino Acid

CC

O

OH

R

H2N

Carboxylic End and Amine EndCan react with itself

(or similar molecules) in a chain


Polypeptide

Two distinct endsN-terminus is an amine

C-terminus is a carboxylic acid


Carboxylic Acid

RC

O

OH

Alcohol

OH

R'

Ester + Water

RC

O

O R' + H2O


Triglycerides

Gylcerol

OHOH

HO

Fatty Acid(carboxylic acid with long chain)

C12H25COOH

Makes Trigylceride

OCC12H25

OCC12H25

C12H25COO

OO


The three fatty acids canall be the same or different

High levels of triglycerides is linked tobuild up of plaque in the arteries

= heart disease


Alcohol

ROH

Alcohol

HOR'

Ether + Water

RO

R' + H2O


Sugars

Glucose(key factor for sugars lots of hydroxyls)

They can react to form chains of sugarspolysaccharide


Celluose

Very long ether chain(pretty much all plant material)


Polysaccharide (Starch)

Sugars, Carbohydratesmonosaccharides (one)

disaccharides (two)polysaccharides (many)


Condensation Reactions(two molecules make one + water)

Carboxylic Acid + Amine = Amide + water

Carboxylic Acid + Alcohol = Ester + water

Alcohol + Alcohol = Ether + water

Today Organic Carbon Chemistrybarbara.cm.utexas.edu/courses/ch302/files/CH302_042611.pdf · Today Organic Carbon Chemistry ... Organic You know more than you think already What you

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